Effects of Inlet Velocity Profile on Lean Ignition and Lean Blowout Limits of a Bluff Body Flame-Holder

doi:10.13675/j.cnki.tjjs.190487

Journal of Propulsion Technology ›› 2020, Vol. 41 ›› Issue (8): 1814-1822.DOI: 10.13675/j.cnki.tjjs.190487

• Combustion, Heat and Mass Transfer • Previous Articles Next Articles

Effects of Inlet Velocity Profile on Lean Ignition and Lean Blowout Limits of a Bluff Body Flame-Holder

Jiangsu Province Key Laboratory of Aerospace Power Systems，College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

Published:2021-08-15

进口速度分布对钝体稳定器贫油点熄火性能的影响研究

黄亚坤，何小民，朱焕宇，薛冲，郭煜玺

南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室，江苏南京 210016

作者简介:黄亚坤，博士生，研究领域为高速低压火焰稳定技术。E-mail：yakunh@nuaa.edu.cn
基金资助:
南京航空航天大学研究生创新基地（实验室）开放基金（kfjj20180205）。

Abstract

Abstract: In order to explore the effects of non-uniform inlet velocity distribution of combustion chamber on combustion performance, experimental studies are conducted to investigate the characteristics of lean ignition and lean blowout limits at 700K and 0.101MPa with four velocity profiles, namely h/H=0, 3/6, 4/6 and 5/6, where h/H describes the shape of the velocity peak, as h is the length between the velocity peak and channel bottom, H is the height of rectangular channel. Besides, the performance of lean ignition and blowout is well explained by the experimental flow characteristic downstream of the bluff body. Results indicate that overall the lean ignition and lean blowout limits at the uniform inlet velocity profile are greater than those at the non-uniform one. The worst performance of lean ignition and lean blowout occurs at h/H=3/6, while the best one happens at h/H=5/6. With the stepwise increase of h/H from 3/6 to 5/6, the equivalence ratios of lean ignition and lean blowout decrease by 7.39% and 18.45%, respectively. Additionally, the asymmetry recirculation downstream of bluff body occurs at h/H=0 and h/H=3/6, whereas the asymmetry recirculation happens at h/H=4/6 and h/H=5/6, in which the vortex contains a primary and secondary vortex center and there exists a phenomenon that the fluid flows from one vortex to another. At the same time, with the increase of h/H from 3/6 to 5/6, the characteristic length of L_vc_{_}_A and L_vc_{_}_B in the recirculation zone increase 14.56% and 50.70%, respectively.

Key words: Velocity profile;Bluff body;Lean ignition limit;Lean blowout;Flow characteristic

摘要： 为了探究燃烧室不均匀进口速度分布对燃烧性能的影响，采用试验的方法，开展了0.101MPa，700K进口条件下四种进口速度分布对钝体稳定器贫油点熄火性能的影响研究，结合流场特性分析了贫油点熄火性能变化的原因，四种进口速度分布依次为：h/H=0,3/6, 4/6和5/6（其中h为速度峰值距离通道底部的高度，H为试验通道的高度）。结果表明：整体而言，均匀进口贫油点熄火性能优于非均匀进口。当h/H=3/6时，贫油点熄火性能最差；而当h/H=5/6时，贫油点熄火性能最优。随着h/H由3/6增大到5/6时，贫油点火当量比下降7.39%，贫油熄火当量比下降18.45%。当进口速度分布为h/H=0和3/6时，钝体稳定器下游回流区基本对称；而当h/H=4/6和5/6时，钝体下游回流区不对称，且每个涡出现主副双涡心，存在流体由一个涡心向另一个涡心流动的现象。同时，当进口速度分布由h/H=3/6增大到h/H=5/6时，钝体下游回流区变长，其特征长度L_{vc_A}增大14.56%，L_{vc_B}增大50.70%。

关键词: 速度构型;钝体;点火;熄火;流场特性

HUANG Ya-kun, HE Xiao-min, ZHU Huan-yu, XUE Chong, GUO Yu-xi. Effects of Inlet Velocity Profile on Lean Ignition and Lean Blowout Limits of a Bluff Body Flame-Holder[J]. Journal of Propulsion Technology, 2020, 41(8): 1814-1822.

黄亚坤，何小民，朱焕宇，薛冲，郭煜玺. 进口速度分布对钝体稳定器贫油点熄火性能的影响研究[J]. 推进技术, 2020, 41(8): 1814-1822.

References

[1] Mattingly J D, Heiser W H， Lieuwen T. Aircraft Engine Design[M]. Virginia: American Institute of Aeronautics and Astronautics Inc， 2002.
[2] Lovett J A， Brogan D S， Philippona D， et al. Development Needs for Advanced Afterburner Designs[R]. AIAA 2004-4192.
[3] Shanbhogue S J， Husain S， Lieuwen T. Lean Blowoff of Bluff Body Stabilized Flames: Scaling and Dynamics[J]. Progress in Energy & Combustion Science， 2009， 35(1):98-120.
[4] Williams G C， Hottel H C， Scurlock A C. Flame Stabilization and Propagation in High Velocity Gas Streams[J]. Symposium on Combustion & Flame & Explosion Phenomena， 1948， 3(1): 21-40.
[5] Longwell J P， Weiss M A. Mixing and Distribution of Liquids in High-Velocity Air Streams[J]. Industrial & Engineering Chemistry Research， 1953， 45(3): 667-677.
[6] Zukoski E E， Marble F E. The Role of Wake Transition in the Process of Flame Stabilization in the Bluff Bodies[M]. London: Butterworth Scientific Publishers， 1954.
[7] Plee S L， Mellor A M. Characteristic Time Correlation for Lean Blowoff of Bluff-Body-Stabilized Flames[J]. Combustion & Flame， 1979， 35(79): 61-80.
[8] Glassman I. Environmental Combustion Considerations-8[M]. New York: Academic Press， 1996.
[9] Carr Z R， Forliti D J. On the Evolution of Vorticity for Bluff-Body Stabilized Premixed Flames[R]. AIAA 2010-1334.
[10] Tuttle S， Chaudhuri S， Kostka S， et al. Transitional Blowoff Behavior of Wake-Stabilized Flames in Vitiated Flow[R]. AIAA 2010-220.
[11] Kostka S， Roy S， Huelskamp B， et al. Characterization of Bluff-Body-Flame Vortex Shedding Using Proper Orthogonal Decomposition[R]. AIAA 2011-599.
[12] 李概奇，王家骅. 低压下V形火焰稳定器后回流区流动特性研究[J]. 航空学报， 1989， 10(8): 447-449.
[13] 杨茂林，黄勇，顾善建，等. 燃油分布对V形稳定器后燃烧的影响[J]. 航空动力学报， 1996， 11（1）: 49-53.
[14] 张彭岗. 典型稳定器和先进值班稳定器试验研究[D]. 南京：南京航空航天大学， 2005.
[15] 叶超. 冲压燃烧室关键部件方案设计与性能验证试验研究[D]. 南京：南京航空航天大学， 2008.
[16] Wasserbauer C， Hathaway M. Development of the Seeding System Used for Laser Velocimeter Surveys of the NASA Low-Speed Centrifugal Compressor Flow Field[J]. AIAA Journal， 1993， 8(1): 300-313.
[17] Clarke J S， Jackson S R. General Considerations in the Design of Combustion Chambers for Aircraft and Industrial Gas Turbines[J]. SAE Transactions， 1964， 72: 96-115.
[18] Shadowen J H， Egan W J J. Evaluation of Circumferential Airflow Uniformity Entering Combustors from Compressors. Volume 1: Discussion of Data and Results[R]. NASA TND-15693， 1972.
[19] Conrad E W， Scbolewski A E. Investigation of Effects of Inlet-Air Velocity Distortion on Performance of Turbojet Engine[R]. NACA-RM-E50G11， 1950.
[20] Scbultz D F， Perkins P J. Effects of Radial and Circumferential Inlet Velocity Profile Distortions on Performance of a Short-Length Double-Annular Ram-Induction Combustor[R]. NASA TND-6706， 1972.
[21] Kopp-Vaughan K M， Jensen T R， Cetegen B M， et al. Analysis of Blowoff Dynamics from Flames with Stratified Fueling[J]. Proceedings of the Combustion Institute， 2013， 34(1): 1491-1498.
[22] Tuttle S G， Chaudhuri S， Kopp-Vaughan K M， et al. Lean Blowoff Behavior of Asymmetrically-Fueled Bluff Body-Stabilized Flames[J]. Combustion & Flame， 2013， 160(9): 1677-1692.
[23] Chaudhuri S， Kostka S， Renfro M W， et al. Blowoff Dynamics of Bluff Body Stabilized Turbulent Premixed Flames[J]. Combustion & Flame， 2010， 157(4): 790-802.
[24] Huelskamp B， Goss L P， Richardson D， et al. Fuel Distribution and Gas Temperature Measurements in a Nonuniformly-Fueled Bluff-Body Flame[C]. Salt Lakecity: 52nd AIAA/SAE/ASEE Joint Propulsion Conference, 2016.
[25] 洪亮. 不均匀流场下稳定器后燃油浓度场研究[D]. 南京：南京航空航天大学， 2014.
[26] 薛冲. 不均匀流场下稳定器流动和燃烧性能研究[D]. 南京：南京航空航天大学， 2014.
[27] 张炎，王寅会，何小民，等. 不均匀流对V型火焰稳定器燃烧性能的影响[J]. 推进技术， 2017， 38(6):1310-1317.
[28] 赵自强，何小民，丁国玉，等. 旋流器流量分配对三级旋流流场特性的影响[J]. 推进技术， 2017， 38（1）： 140-146.
[29] Jin Y， Li Y， He X， et al. Experimental Investigations on Flow and Combustion Characteristics of a Model Trapped Vortex Combustor[J]. Applied Energy， 2014， 134: 257-269.
[30] Jiang B， Jin Y， Liu D， et al. Effects of Multi-Orifice Configurations of the Quench Plate on Mixing Characteristics of the Quench Zone in an RQL-TVC Model[J]. Experimental Thermal and Fluid Science， 2017， 83: 57-68.
[31] 丁兆波，金捷. 某型蒸发式稳定器气动及燃烧特性研究[J]. 火箭推进， 2013， 39(3): 27-31.
[32] 侯晓春，季鹤鸣，刘庆国，等. 高性能航空燃气轮机燃烧技术[M]. 北京:国防工业出版社， 2002.
[33] 程晓军. 串联式TBCC超级燃烧室燃烧组织及性能研究[D]. 南京:南京航空航天大学， 2015.
[34] Vogel F， Smith K A， Tester J W， et al. Engineering Kinetics for Hydrothermal Oxidation of Hazardous Organic Substances[J]. AICHE Journal， 2002， 48(8): 1827-1839.
[35] Li M， He X， Zhao Y， et al. Performance Enhancement of a Trapped-Vortex Combustor for Gas Turbine Engines Using a Novel Hybrid-Atomizer[J]. Applied Energy， 2018， 216: 286-295.
[36] Dutka M， Ditaranto M， L?v?s T. Investigations of Air Flow Behavior Past a Conical Bluff Body Using Particle Imaging Velocimetry[J]. Experiments in Fluids， 2015， 56(11).

Effects of Inlet Velocity Profile on Lean Ignition and Lean Blowout Limits of a Bluff Body Flame-Holder

进口速度分布对钝体稳定器贫油点熄火性能的影响研究

PDF

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 0

Recommended Articles

Metrics

Comments